Experiments in which neither participants nor the people analyzing the results know who is in the control group.<ref>Wile, Dr. Jay L. ''Exploring Creation Through General Science''. Anderson: Apologia Educational Ministries, Inc.
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Experiments in which neither participants nor the people analyzing the results know who is in the control group.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.